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[英]Keras - ValueError: The first layer in a Sequential model must get an `input_shape` or `batch_input_shape` argument
[英]How to specify input_shape for Keras Sequential model
您如何處理此錯誤?
檢查目標時出錯:預期density_3的形狀為(1,),但數組的形狀為(398,)
我試圖更改input_shape =(14,),它是train_samples中的列數,但仍然出現錯誤。
set = pd.read_csv('NHL_DATA.csv')
set.head()
train_labels = [set['Won/Lost']]
train_samples = [set['team'], set['blocked'],set['faceOffWinPercentage'],set['giveaways'],set['goals'],set['hits'],
set['pim'], set['powerPlayGoals'], set['powerPlayOpportunities'], set['powerPlayPercentage'],
set['shots'], set['takeaways'], set['homeaway_away'],set['homeaway_home']]
train_labels = np.array(train_labels)
train_samples = np.array(train_samples)
scaler = MinMaxScaler(feature_range=(0,1))
scaled_train_samples = scaler.fit_transform(train_samples).reshape(-1,1)
model = Sequential()
model.add(Dense(16, input_shape=(14,), activation='relu'))
model.add(Dense(32, activation='relu'))
model.add(Dense(2, activation='softmax'))
model.compile(Adam(lr=.0001), loss='sparse_categorical_crossentropy', metrics=['accuracy'])
model.fit(scaled_train_samples, train_labels, batch_size=1, epochs=20, shuffle=True, verbose=2)
1)使用.reshape(-1,1)
重塑您的訓練示例,這意味着所有訓練樣本都具有1維。 但是,您將網絡的輸入形狀定義為input_shape=(14,)
,該形狀告訴輸入維為14。我想這是模型的一個問題。
2)您使用了sparse_categorical_crossentropy
,這意味着地面真相標簽是稀疏的( train_labels
應該是稀疏的),但我猜不是。
這是您的輸入應如何的示例:
import numpy as np
from tensorflow.python.keras.engine.sequential import Sequential
from tensorflow.python.keras.layers import Dense
x = np.zeros([1000, 14])
y = np.zeros([1000, 2])
model = Sequential()
model.add(Dense(16, input_shape=(14,), activation='relu'))
model.add(Dense(32, activation='relu'))
model.add(Dense(2, activation='softmax'))
model.compile('adam', 'categorical_crossentropy')
model.fit(x, y, batch_size=1, epochs=1)
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